Vertical eddy diffusivity for oil dispersion in upper ocean Langmuir turbulence

One widely used parameterization for modeling upper ocean oil dispersion is the K-profile parameterization (KPP) [Large et al., 1994], which models the eddy viscosity and eddy diffusivity in the format of a one-dimensional vertical profile. The standard KPP model was developed for pure wind-induced shear turbulence and the effect of Langmuir circulations was not included. The current dataset contains profiles of eddy diffusivities for vertical diffusion of oil plumes in ocean mixed layer with Langmuir circulations in presence. The profiles are based on statistical analysis of a series of large eddy simulations, covering various turbulent Langmuir numbers (ranging from 0.36 to 0.61) and oil droplet diameters (ranging from 88 microns to 354 microns). The current dataset provides useful information for assessing existing KPP models and developing new KPP models with the effect Langmuir circulations properly parameterized. More details of the simulations and data analysis can be found in the paper "Oil plumes and dispersion in Langmuir, upper-ocean turbulence: large-eddy simulations and K-profile parameterization" (Journal of Geophysical Research, DOI: 10.1002/2014JC010542).用于模拟上层海洋石油扩散的常用参数化方案之一为K剖面参数化（K-profile parameterization, KPP）[Large等，1994]，该方案以一维垂直剖面的形式对涡动粘度与涡动扩散率进行建模。经典KPP模型仅针对纯风致剪切湍流开发，未纳入朗缪尔环流（Langmuir circulations）的影响。本数据集包含存在朗缪尔环流时，海洋混合层内石油羽流垂直扩散对应的涡动扩散率剖面。该剖面系列基于多组大涡模拟（large eddy simulations）的统计分析，覆盖了取值范围为0.36~0.61的湍流朗缪尔数，以及88微米~354微米的油滴直径。本数据集可为评估现有KPP模型，以及开发合理参数化朗缪尔环流影响的新型KPP模型提供重要参考依据。有关模拟与数据分析的更多细节，可参阅论文《朗缪尔环流与上层海洋湍流中的石油羽流及扩散：大涡模拟与K剖面参数化》（*Journal of Geophysical Research*，DOI: 10.1002/2014JC010542）。